Luminescent Properties Of Li2B4O7 (LTB) Polycrystals At The Deviation From Stoichiometry

Hunda, B. M.; Solomon, A. M.; Holovey, V. M.; Hunda, T. V.; Puga, P. P.; Mariychuk, Ruslan

doi:10.1007/978-94-010-0632-3_25

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“…2) was found to far exceed (by two orders of magnitude at 2.4 mol % excess B 2 O 3 ) that in the crystals grown at B 2 O 3 excesses no higher than 0.5 mol %. In particular, the glow curves of the crystals grown at a B 2 O 3 excess of 1.6 mol % showed a strong peak at 463 K with a full width at half maximum (FWHM) of about 30 K. A similar peak was observed earlier [15] at about 473 K in the glow curves of undoped polycrystalline B 2 O 3 -enriched LTB samples, which contained LiB 3 O 5 , identified by XRD.…”

Section: Resultssupporting

confidence: 65%

“…On the other hand, our results demonstrate that the TL and roentgenoluminescence (RL) of polycrystalline LTB-based samples depend significantly on their stoichiometry (excess B 2 O 3 increases TL intensity and reduces RL intensity) [15,16] [20,21]. For this reason, to obtain highquality LTB crystals the growth charge must be slightly enriched in boron oxide [21,22].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Melt Composition on the Luminescent Properties of Czochralski-Grown Li2B4O7 Single Crystals

et al. 2005

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Li 2 B 4 O 7 (LTB) single crystals are grown from stoichiometric and B 2 O 3 -enriched (1.6 and 2.4 mol %) melts. At large B 2 O 3 excesses, the thermoluminescence intensity in the crystals is markedly higher, attesting to an increased density of structural defects. LTB crystals grown from B 2 O 3 -enriched melts may contain zones enriched in two types of defects. Defects of one type result from the breaking of bonds involving bridging oxygens, without significant changes in the position of neighboring atoms. Defects of the other type appear at large B 2 O 3 excesses in the melt, which enable more significant changes in the structure of the boronoxygen framework, leading to the formation of nanoscale regions differing in composition from LTB. The present results may be helpful in assessing the quality of LTB single crystals and in optimizing the crystal growth of LTB.

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Section: Resultssupporting

confidence: 65%